Add back unseparated out version of method overloads in dart:html.

tools/dom/dom.json

 {
   "ANGLEInstancedArrays": {
     "members": {
       "VERTEX_ATTRIB_ARRAY_DIVISOR_ANGLE": {
         "support_level": "untriaged"
       },
       "drawArraysInstancedANGLE": {
         "support_level": "untriaged"
       },
       "drawElementsInstancedANGLE": {
@@ skipping 10529 matching lines @@
       },
       "append": {
         "support_level": "nonstandard"
       },
       "appendBuffer": {
         "support_level": "untriaged"
       },
       "appendBufferView": {
         "support_level": "untriaged"
       },
+      "appendByteBuffer": {
+        "support_level": "untriaged"
+      },
       "appendStream": {
         "support_level": "untriaged"
       },
+      "appendTypedData": {
+        "support_level": "untriaged"
+      },
       "appendWindowEnd": {
         "support_level": "untriaged"
       },
       "appendWindowStart": {
         "support_level": "untriaged"
       },
       "buffered": {},
       "dispatchEvent": {
         "support_level": "untriaged"
       },
@@ skipping 2504 matching lines @@
       "importStylesheet": {},
       "removeParameter": {},
       "reset": {},
       "setParameter": {},
       "transformToDocument": {},
       "transformToFragment": {}
     },
     "support_level": "nonstandard"
   }
 }